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"People who have no weaknesses are terrible; there is no way of taking advantage of them."

"The impotence of God is infinite."

"The finest words in the world are only vain sounds if you cannot understand them."

"Never lend books - nobody ever returns them; the only books I have in my library are those which people have lent me."

"To accomplish great things, we must dream as well as act."

"Man is so made that he can only find relaxation from one kind of labor by taking up another."

"What is written without effort is in general read without pleasure."

"There is no 'royal road' to geometry."

"Ita€?s a wonder man can eat at all, when things are big that should be small."

"The difficult child is the child who is unhappy. He is at war with himself; and in consequence, he is at war with the world."

"Life is a God-damned, stinking, treacherous game and nine hundred and ninety-nine men out of a thousand are bastards."

"The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit."